/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.raft.jraft.storage.impl;

import java.util.List;
import java.util.NavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;
import org.apache.ignite.raft.jraft.entity.LogEntry;
import org.apache.ignite.raft.jraft.option.LogStorageOptions;

/**
 * {@link Logs} implementation that stores the logs on-heap.
 */
public class OnHeapLogs implements Logs {
    private final NavigableMap<Long, LogEntry> map = new ConcurrentSkipListMap<>();

    @Override
    public boolean init(LogStorageOptions opts) {
        return true;
    }

    @Override
    public void shutdown() {
        // no-op
    }

    @Override
    public LogEntry getEntry(long index) {
        return map.get(index);
    }

    @Override
    public void appendEntry(LogEntry entry) {
        map.put(entry.getId().getIndex(), entry);
    }

    @Override
    public void appendEntries(List<LogEntry> entries) {
        for (LogEntry entry : entries) {
            appendEntry(entry);
        }
    }

    @Override
    public void truncatePrefix(long firstIndexKept) {
        map.headMap(firstIndexKept).clear();
    }

    @Override
    public void truncateSuffix(long lastIndexKept) {
        map.tailMap(lastIndexKept, false).clear();
    }

    @Override
    public void reset() {
        map.clear();
    }
}
